AD NUMBER: 2017-25-01

SUMMARY: This AD was prompted by a report indicating that the lower rib foot angle of the center wing box did not match with the bottom skin panel inner surface.

This AD requires repetitive inspections for cracking of the external bottom skin in certain areas on the left and right wings, and corrective actions if necessary.

COST: The FAA estimates that this AD affects 10 airplanes of U.S. registry. Cost of compliance for inspections is estimated to be $425 per aircraft per inspection cycle. Modifications are estimated to cost $8,470 per aircraft for parts and labor.